<html>
<head></head>
<body>
This page records the navigationStart value and the initial and latest timestamp
of the pageShow event.
This page also has one same-origin and one cross-origin subframe, both of them
have an onpageshow() event listener.
</body>
  <script>
    window.addEventListener("pageshow", (e) => {
      if (typeof window.initialPageShowTimeStamp === 'undefined') {
        window.initialPageShowTimeStamp = e.timeStamp;
      }
      window.latestPageShowTimeStamp = e.timeStamp;
    });
    window.initialNavigationStart = performance.timing.navigationStart;
  </script>
 <iframe src="/cross-site/bar.com/back_forward_cache/page_with_pageshow.html"/>
 <iframe src="page_with_pageshow.html"/>
</html>
